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Post Info TOPIC: TNO (225088) 2007 OR10


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RE: TNO (225088) 2007 OR10
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Hubble Spots Moon Around Third Largest Dwarf Planet

Astronomers have uncovered a moon around another dwarf planet by using the combined power of three space observatories, including archival images from the Hubble Space Telescope. Called 2007 OR10, it is the third-largest dwarf planet in the Kuiper Belt. With this moon's discovery, most of the known dwarf planets in the Kuiper Belt larger than 600 miles across have companions. These bodies provide insight into how moons formed in the young solar system. In fact, there is an emerging view that collisions between planetary bodies can result in the formation of moons. Based on moon rock samples from NASA's Apollo mission, astronomers believe that Earth's only natural satellite was born out of a collision with a Mars-sized object 4.4 billion years ago.
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Trans-Neptunian object (225088) 2007OR10
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Title: Discovery of a satellite of the large trans-Neptunian object (225088) 2007OR10
Author: Csaba Kiss, Gábor Marton, Anikó Farkas-Takács, John Stansberry, Thomas Müller, József Vinkó, Zoltán Balog, Jose-Luis Ortiz, András Pál

2007OR10 is currently the third largest known dwarf planet in the transneptunian region, with an effective radiometric diameter of ~1535 km. It has a slow rotation period of ~45 h that was suspected to be caused by tidal interactions with a satellite undetected at that time. Here we report on the discovery of a likely moon of 2007OR10, identified on archival Hubble Space Telescope WFC3/UVIS system images. Although the satellite is detected at two epochs, this does not allow an unambiguous determination of the orbit and the orbital period. A feasible 1.5-5.8x10^21 kg estimate for the system mass leads to a likely 35 to 100 d orbital period. The moon is about 4.2m fainter than 2007OR10 in HST images that corresponds to a diameter of 237 km assuming equal albedos with the primary. Due to the relatively small size of the moon the previous size and albedo estimates for the primary remains unchanged. With this discovery all trans-Neptunian objects larger than 1000 km are now known to harbour satellites, an important constraint for moon formation theories in the young Solar system.

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RE: TNO (225088) 2007 OR10
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2007 OR10 has a moon

With a slow rotation period of 45 hours, astronomers have suspected for a while that 2007 OR10 had a moon, whose tidal interactions with the primary would have been responsible for slowing its rotation. Marton et al report the discovery in a set of older Hubble WFC3 images taken in September 2010. The new moon likely has a diameter of roughly 300 kilometers (roughly Hyperion-sized), as compared to 2007 OR10's roughly 1575 kilometers (roughly Rhea-sized). Although 300 kilometers is fully 20% of the diameter of the primary, Marton and coworkers state that, given a likely very dark surface, it doesn't contribute enough reflected light to 2007 OR10's signal to affect diameter estimates for the larger body. It is also too far from the parent body for the two to be in mutually synchronous rotation.
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Kuiper Belt Object (225088) 2007 OR10
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Kuiper Belt Object (225088) 2007 OR10 is at Opposition (86.355 AU) in the constellation Aquarius on the 27th August 2015

Ephemeris

Date       UT      R.A. (J2000) Decl.    Delta     r     El.    Ph.   Mag
2015 08 26 000000 22 21 49.6 -12 59 34  86.352  87.361  177.4   0.0  21.4
2015 08 27 000000 22 21 47.1 -12 59 46  86.353  87.362  177.3   0.0  21.4
2015 08 28 000000 22 21 44.6 -12 59 58  86.354  87.363  176.9   0.0  21.4
2015 08 29 000000 22 21 42.2 -13 00 10  86.355  87.363  176.3   0.0  21.4
2015 08 30 000000 22 21 39.7 -13 00 22  86.357  87.364  175.5   0.1  21.4
2015 08 31 000000 22 21 37.3 -13 00 34  86.359  87.365  174.7   0.1  21.4
2015 09 01 000000 22 21 34.9 -13 00 46  86.362  87.365  173.9   0.1  21.4
2015 09 02 000000 22 21 32.4 -13 00 58  86.364  87.366  173.0   0.1  21.4
2015 09 03 000000 22 21 30.0 -13 01 10  86.367  87.367  172.0   0.1  21.4
2015 09 04 000000 22 21 27.5 -13 01 21  86.371  87.367  171.1   0.1  21.4
2015 09 05 000000 22 21 25.1 -13 01 33  86.374  87.368  170.2   0.1  21.4
2015 09 06 000000 22 21 22.7 -13 01 45  86.378  87.369  169.2   0.1  21.4
2015 09 07 000000 22 21 20.3 -13 01 56  86.382  87.369  168.3   0.1  21.4
2015 09 08 000000 22 21 17.9 -13 02 07  86.387  87.370  167.3   0.1  21.4
2015 09 09 000000 22 21 15.5 -13 02 19  86.391  87.371  166.3   0.2  21.4
2015 09 10 000000 22 21 13.1 -13 02 30  86.396  87.371  165.4   0.2  21.4


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RE: TNO (225088) 2007 OR10
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Kuiper Belt Object 225088 (2007 OR10) is at Opposition (86.117 AU) on the 26th August 2014

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     Mag
2014 08 25    22 21 00.3 -13 15 24  86.1133 87.1230   177.1     0.0    21.4
2014 08 26    22 20 57.8 -13 15 36  86.1141 87.1236   177.2     0.0    21.4
2014 08 27    22 20 55.3 -13 15 48  86.1152 87.1243   177.0     0.0    21.4
2014 08 28    22 20 52.9 -13 16 00  86.1166 87.1249   176.5     0.0    21.4
2014 08 29    22 20 50.4 -13 16 12  86.1182 87.1256   175.8     0.0    21.4
2014 08 30    22 20 47.9 -13 16 24  86.1202 87.1262   175.0     0.1    21.4
2014 08 31    22 20 45.5 -13 16 36  86.1225 87.1269   174.2     0.1    21.4
2014 09 01    22 20 43.0 -13 16 47  86.1251 87.1275   173.3     0.1    21.4
2014 09 02    22 20 40.6 -13 16 59  86.1279 87.1282   172.4     0.1    21.4
2014 09 03    22 20 38.1 -13 17 11  86.1310 87.1288   171.5     0.1    21.4
2014 09 04    22 20 35.7 -13 17 23  86.1345 87.1295   170.5     0.1    21.4
2014 09 05    22 20 33.3 -13 17 34  86.1382 87.1301   169.6     0.1    21.4
2014 09 06    22 20 30.8 -13 17 46  86.1422 87.1308   168.6     0.1    21.4
2014 09 07    22 20 28.4 -13 17 57  86.1465 87.1314   167.7     0.1    21.4
2014 09 08    22 20 26.0 -13 18 08  86.1511 87.1321   166.7     0.2    21.4
2014 09 09    22 20 23.6 -13 18 19  86.1560 87.1328   165.8     0.2    21.4
2014 09 10    22 20 21.2 -13 18 31  86.1611 87.1334   164.8     0.2    21.4
2014 09 11    22 20 18.8 -13 18 42  86.1665 87.1341   163.8     0.2    21.4
2014 09 12    22 20 16.5 -13 18 53  86.1723 87.1347   162.9     0.2    21.4
2014 09 13    22 20 14.1 -13 19 03  86.1783 87.1354   161.9     0.2    21.4
2014 09 14    22 20 11.8 -13 19 14  86.1845 87.1360   160.9     0.2    21.4
2014 09 15    22 20 09.4 -13 19 25  86.1911 87.1367   160.0     0.2    21.4
2014 09 16    22 20 07.1 -13 19 35  86.1979 87.1373   159.0     0.2    21.4
2014 09 17    22 20 04.8 -13 19 46  86.2050 87.1380   158.0     0.2    21.4
2014 09 18    22 20 02.5 -13 19 56  86.2124 87.1386   157.0     0.3    21.4
2014 09 19    22 20 00.3 -13 20 06  86.2201 87.1393   156.1     0.3    21.4
2014 09 20    22 19 58.0 -13 20 16  86.2280 87.1399   155.1     0.3    21.4
2014 09 21    22 19 55.8 -13 20 26  86.2362 87.1406   154.1     0.3    21.5
2014 09 22    22 19 53.6 -13 20 35  86.2446 87.1412   153.1     0.3    21.5
2014 09 23    22 19 51.4 -13 20 45  86.2534 87.1419   152.1     0.3    21.5
2014 09 24    22 19 49.2 -13 20 54  86.2624 87.1425   151.2     0.3    21.5
2014 09 25    22 19 47.1 -13 21 04  86.2716 87.1432   150.2     0.3    21.5
2014 09 26    22 19 44.9 -13 21 13  86.2811 87.1438   149.2     0.3    21.5
2014 09 27    22 19 42.8 -13 21 22  86.2909 87.1445   148.2     0.3    21.5
2014 09 28    22 19 40.8 -13 21 30  86.3009 87.1451   147.2     0.4    21.5
2014 09 29    22 19 38.7 -13 21 39  86.3112 87.1458   146.2     0.4    21.5
2014 09 30    22 19 36.7 -13 21 47  86.3217 87.1465   145.2     0.4    21.5


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Kuiper Belt Object 225088 (2007 OR10) is at Opposition (85.875 AU) on the 25th August, 2013

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     Mag
2013 08 24    22 20 10.5 -13 31 18  85.8740 86.8835   176.8     0.0    21.4
2013 08 25    22 20 08.0 -13 31 30  85.8746 86.8841   177.1     0.0    21.4
2013 08 26    22 20 05.6 -13 31 42  85.8756 86.8848   177.0     0.0    21.4
2013 08 27    22 20 03.1 -13 31 54  85.8768 86.8854   176.6     0.0    21.4
2013 08 28    22 20 00.6 -13 32 06  85.8784 86.8861   176.0     0.0    21.4
2013 08 29    22 19 58.2 -13 32 18  85.8802 86.8867   175.3     0.1    21.4
2013 08 30    22 19 55.7 -13 32 30  85.8824 86.8874   174.5     0.1    21.4
2013 08 31    22 19 53.2 -13 32 42  85.8848 86.8881   173.6     0.1    21.4


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TNO (225088) 2007 OR10 (Snow White) at Quadrature at 03:00 UT, 28th November, 2012.

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Kuiper Belt Object 225088 (2007 OR10) is at Opposition (85.635 AU) on the 24th August, 2012.



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Trans-Neptunian Object 2007 OR10 was discovered in 2007

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TNO (225088) 2007 OR10 (Snow White) is in Conjunction on the 20th February, 2012



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